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This article describes the MSB4078 error code.
Message text
MSB4078: The project file 'value' is not supported by MSBuild and cannot be built.
Description
This error occurs when a project file contains a project of a type that can't be built by MSBuild. Most modern project types support MSBuild, but some older project types in Visual Studio, and project types supported in Visual Studio extensions, do not.
This issue only occurs when you build from the MSBuild or dotnet command line; the solution should still build in Visual Studio, if the required workloads, components, and extensions are installed.
Resolution
If your solution contains project types that don't support MSBuild, use devenv /build to build the solution on the command line. See /Build (devenv.exe).
Applies to
All versions of MSBuild